Etiologic Evaluation of Ischemic Stroke in Young Adults: A Comparative Study between Two European Centers

Introduction: Identifying the cause of ischemic stroke in young adults is often difficult. Our objective was to compare the etiologic diagnostic strategy for ischemic stroke in young adults between 2 European centers and investigate the influence of workup variations in the diagnosed etiologies. Patients and Methods: We included patients aged 18-55 years admitted for ischemic stroke or transient ischemic attack to the stroke units of Santa Maria Hospital in Lisbon, Portugal, and Innsbruck University Hospital in Innsbruck, Austria, between 2014 and 2016. Etiology and diagnostic procedures were compared between centers. Results: We included 156 patients from Innsbruck University Hospital and 110 patients from Santa Maria Hospital. Search for intracranial large-vessel disease was performed mainly by computed tomography/ magnetic resonance angiography in Innsbruck (83.9% versus 52.7%; P < .01) and by transcranial Doppler in Lisbon (91.8% versus 43.2%; P < .01). Transoesophageal echocardiography was preferred in Innsbruck for detecting paradoxical embolism (80.0% versus 68.2%; P < .05), whereas in Lisbon contrast transcranial Doppler was preferred (80.9% versus 3.9%; P < .01). For investigation of other causes, Lisbon patients were more commonly screened for thrombophilia (100.0% versus 92.3%; P < .05) and autoimmune disorders (91.7% versus 44.5%; P < .01) while in Innsbruck consultation by other specialists was more frequent (51.6% versus 10.0%; P < .01). No significant differences were found in etiologies between centers. Conclusion: The differences in diagnostic workup did not influence etiologic diagnosis. Extensive laboratory testing does not seem to influence diagnosis of stroke of other determined cause, emphasizing the importance of a clinically-oriented approach for the etiologic diagnosis of stroke in young adults.